66648177755 has 4 divisors (see below), whose sum is σ = 79977813312. Its totient is φ = 53318542200.

The previous prime is 66648177709. The next prime is 66648177773. The reversal of 66648177755 is 55777184666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66648177755 - 2¹² = 66648173659 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6664817771 + ... + 6664817780.

It is an arithmetic number, because the mean of its divisors is an integer number (19994453328).

Almost surely, 2^66648177755 is an apocalyptic number.

66648177755 is a deficient number, since it is larger than the sum of its proper divisors (13329635557).

66648177755 is a wasteful number, since it uses less digits than its factorization.

66648177755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13329635556.

The product of its digits is 59270400, while the sum is 62.

The spelling of 66648177755 in words is "sixty-six billion, six hundred forty-eight million, one hundred seventy-seven thousand, seven hundred fifty-five".